OPTION FOR THE HYDROSTATIC STEP (OPTION POUR L’ETAPE HYDROSTATIQUE)

Wave equation in 3D: new algorithm for the hydrostatic step, no call to TELEMAC-2D

1 : as before

2 : wave equation

A notable speed-up, nearly a factor 2 in hydrostatic mode, but sometimes unstable. When unstable, may be stabilized by setting : IMPLICITATION FOR DIFFUSION = 2., but this is not yet fully investigated, at least safe when looking for a steady state.